Measurement of magnetic field deviation and the effect at HIMAC synchrotron
Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius...
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Transcript of Department of Physics Kyoto University Tetsuya MURAKAMI HIMAC Pion Experiment and Pb Isotope Radius...
Department of Physics
Kyoto University
Tetsuya MURAKAMI
HIMAC Pion Experiment and Pb Isotope Radius Measurements
Pion Ratios and ESYM
Neutron Star vs Nuclear EOS
E/A
Density (ρB)
L
ρ0 2ρ0
(nucleon,electron,μ)
(nucleon,hyperon,meson,quark)
PhaseTransition
High Density
Low Density
EOS
Mass
Radius
Low Density
High Density
Mass Limit
Observations of Mass and RadiusPhase
Transition
MR(Mass-Radius) Relation
TOV equation
Tolman–Oppenheimer–Volkoff equation
Useful Notations
3LKK
EK
EL
ES
EK
KLEE
KEE
EEE
sym
symsym
sym
sym
pn
symsymsym
sym
6
)(9
)(3
)(
3/)(
/)(
)0,(9
)(2
)()(
)(2
)0,()0,(
)()()0,(),(
0
0
0
2
220
0
0
00
2
2200
320
3200
42
It started in 2000 from Alex`s paper, PRL85, 5296 (2000)
4
He urged experimentalists to measure a neutron skin thickness of 208Pb precisely.
We challenge to ALEX and PREX.
Neutron Density Distributions of Pb Isotopes
From J. Zenihiro’s PhD thesis 2011
PRC82, 054607 (2010)
5
6
RCNP, Osaka University
Polarized Proton beams of 295 MeVTypical polarization ~75%
7
Analysis
Relativistic Impulse Approximation developed by Murdock and Horowittz (MH)
Realistic point proton density distribution deduced from electron scattering data
Scalar density = 0.96 Vector density Neutron density = Sum of Gaussian
8
9
10
11
054.0063.0
208
048.0064.0
206
047.0059.0
204
211.0
180.0
178.0
)(
Pb
Pb
Pb
fmrnp
12
13
14
S=33.0±1.1 MeVL=67.0±12.1 MeV
15
Li et al.(2009)
Summary of neutron skin thickness
16
054.0063.0
208
048.0064.0
206
047.0059.0
204
211.0
180.0
178.0
)(
Pb
Pb
Pb
fmrnp
S=33.0±1.1 MeVL=67.0±12.1 MeV
Unfortunately, doesn`t look like sufficiently precise.
17
ESPRI (Elastic Scattering of Proton with RI beam) Project
One of Future Directions
• Beam line MWDCs• Solid hydrogen target (1mm thick)• Large MWDCs for recoil protons• Array of 14 NaI(Tl)• Array of Silicon Strip Detectors
We have measured elastic scatterings on 20O, 9-11C, and 66,70Ni.
According to Bao-An’s calculation from NPA 708 (2002) 365.
18
19
Au+Au
?
MSU
RIBF
GSI
Isospin diffusion, n-p flow
Pion production
Xia
o, e
t al., a
rXiv
:08
08
.01
86
(20
08
)R
eis
do
rf, et a
l., NP
A 7
81
(20
07
) 45
9.
S=33.0±1.1 MeVL=67.0±12.1 MeVKsym=-148±124 MeV
HIMAC Pion Experiments Details will be presented by Mr. Sako
tomorrow. Our on-going SAMURAI-TPC project
along the same direction will be presented by Dr. Isobe this afternoon.
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Using Minimum Setup Centrality Filter
Multiplicity filter for Charged Particles
Portable, If possible. Pion Detector
Simple and portable system
HIMAC
Performed Experiments
2008.11In
(Pb)132Xe 400
MeV/u
2009.7In
(Pb) 28Si 400
MeV/u
2009.10In
(Pb) 28Si 600
MeV/u
2009.11 In 28Si 800 MeV/u
Target Beam energy 30deg 45deg 60deg 75deg 90deg 120deg
○○○○○○
○○○○○○
○○○○○
○○○○
Beam Energy Dependence : Silo
g s
cale
π
- /π+
Erapπ (MeV)
400 MeV 600 MeV
800 MeV
● 45deg■ 60deg▼ 90deg○ 120deg
Slopes depend on Beam Energy
Fitting : C*X-a
slope α:• 400 : (4.5±0.5)×10-1
• 600 : (3.2±0.5)×10-1
• 800 : (2.0±0.5)×10-1
log
sca
le
π- /π
+
log
sca
le
π- /π
+
If we are lucky, we are going to measure pions from 129,132,136Xe on CsI reactions at 400 MeV/u in FY2011.
25
Please come back for Mr. Sako‘s talk
Thank you
Members of Collaboration
RCNP E248 Collaboration Kyoto University
J. Zenihiro, Y. Iwao,
H. Sakaguchi, S. Terashima,
Y. Yasuda, M. Yosoi Research Center for Nuclear
Physics
M. Itoh, M. Uchida, H.P. Yoshida
HIMAC P226 Collaboration Kyoto University
M. Sako, S. Ebesu, Y. Ichikawa, S. Imajo,
R. Sameshima Rikkyo University
K. Ieki, Y. Ikeda, H.
Kawamura, M. Matsushita, J. Murata, M. Nitta, T. Toyoda
RIKEN Nishina Center
Y. Nakai, S. Nishimura NIRS
E. Takada,
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